Which of the following statements is true about the function f(x) = a3 + 6x2? a. None of these. O b. The graph of f is concave downward on (-0, 2). O c. The graph of f is concave upward on (-2, ). O d. The graph of f is concave upward on (-00, 2). The graph of f is concave upward on (2, 00). е.

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